Definition of actinium in English:

actinium

noun akˈtɪnɪəmækˈtɪniəm

mass noun

The chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores.
（化学元素）锕（符号： Ac ）
Example sentencesExamples
- The first four actinide elements, actinium, thorium, protactinium and uranium are naturally occurring and have been known for a considerable time.
- Along the way, these disintegration series produce radioactive isotopes of protactinium, thorium, actinium, radium, francium, radon, astatine, polonium, bismuth, lead, thallium and mercury.
- Francium was discovered in 1939 by the French physicist Marguerite Perey while she was analyzing the products formed during the radioactive decay of actinium.
- A proposal was patented for a ceramic block pessary using radioactive elements such as thorium, actinium and even radium.
- Actinides - the radioactive chemical elements that span from actinium to lawrencium on the periodic table - have generated a great deal of interest in recent years.

Origin

Early 20th century: from Greek aktis, aktin- 'ray' + -ium.

Rhymes

aluminium, condominium, delphinium

Definition of actinium in US English:

actinium

nounakˈtinēəmækˈtɪniəm

The chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores.
（化学元素）锕（符号： Ac ）
Example sentencesExamples
- Actinides - the radioactive chemical elements that span from actinium to lawrencium on the periodic table - have generated a great deal of interest in recent years.
- A proposal was patented for a ceramic block pessary using radioactive elements such as thorium, actinium and even radium.
- Francium was discovered in 1939 by the French physicist Marguerite Perey while she was analyzing the products formed during the radioactive decay of actinium.
- Along the way, these disintegration series produce radioactive isotopes of protactinium, thorium, actinium, radium, francium, radon, astatine, polonium, bismuth, lead, thallium and mercury.
- The first four actinide elements, actinium, thorium, protactinium and uranium are naturally occurring and have been known for a considerable time.

Origin

Early 20th century: from Greek aktis, aktin- ‘ray’ + -ium.

词汇	actinium
释义	Definition of actinium in English: actinium noun akˈtɪnɪəmækˈtɪniəm mass noun The chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores. （化学元素）锕（符号： Ac ） Example sentencesExamples The first four actinide elements, actinium, thorium, protactinium and uranium are naturally occurring and have been known for a considerable time. Along the way, these disintegration series produce radioactive isotopes of protactinium, thorium, actinium, radium, francium, radon, astatine, polonium, bismuth, lead, thallium and mercury. Francium was discovered in 1939 by the French physicist Marguerite Perey while she was analyzing the products formed during the radioactive decay of actinium. A proposal was patented for a ceramic block pessary using radioactive elements such as thorium, actinium and even radium. Actinides - the radioactive chemical elements that span from actinium to lawrencium on the periodic table - have generated a great deal of interest in recent years. Origin Early 20th century: from Greek aktis, aktin- 'ray' + -ium. Rhymes aluminium, condominium, delphinium Definition of actinium in US English: actinium nounakˈtinēəmækˈtɪniəm The chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores. （化学元素）锕（符号： Ac ） Example sentencesExamples Actinides - the radioactive chemical elements that span from actinium to lawrencium on the periodic table - have generated a great deal of interest in recent years. A proposal was patented for a ceramic block pessary using radioactive elements such as thorium, actinium and even radium. Francium was discovered in 1939 by the French physicist Marguerite Perey while she was analyzing the products formed during the radioactive decay of actinium. Along the way, these disintegration series produce radioactive isotopes of protactinium, thorium, actinium, radium, francium, radon, astatine, polonium, bismuth, lead, thallium and mercury. The first four actinide elements, actinium, thorium, protactinium and uranium are naturally occurring and have been known for a considerable time. Origin Early 20th century: from Greek aktis, aktin- ‘ray’ + -ium.
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